package com.gsd.security.filter;

import com.gsd.security.security.TokenManager;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.web.AuthenticationEntryPoint;
import org.springframework.security.web.authentication.www.BasicAuthenticationFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

public class TokenAuthFilter extends BasicAuthenticationFilter {
    private TokenManager tokenManager;
    private RedisTemplate redisTemplate;
    public TokenAuthFilter(AuthenticationManager authenticationManager, TokenManager tokenManager, RedisTemplate redisTemplate) {
        super(authenticationManager);
        this.redisTemplate= this.redisTemplate;
        this.tokenManager= this.tokenManager;
    }

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws IOException, ServletException {
        //获取当前认证成功用户信息的权限
        UsernamePasswordAuthenticationToken authRequest = getAuthentication(request);
        //判断如果有权限信息，放到权限上下文
        if (authRequest!=null){
            SecurityContextHolder.getContext().setAuthentication(authRequest);
        }
        chain.doFilter(request,response);


    }

    private UsernamePasswordAuthenticationToken getAuthentication(HttpServletRequest request){
        //从hander获取token
        String token =request.getHeader("token");
        if (token!=null){
            //从token获取用户名
            String username=tokenManager.getUserInfoFromToken(token);

            //从redis获取对应权限列表
            List<String> permissionValueList = (List<String>) redisTemplate.opsForValue().get(username);

            Collection<GrantedAuthority> authority =new ArrayList<>();
            for (String permissionValue : permissionValueList){
                SimpleGrantedAuthority auth=new SimpleGrantedAuthority(permissionValue);
                authority.add(auth);
            }
            return new UsernamePasswordAuthenticationToken(username,token,authority);
        }
        return null;
    }

}
